Error 0xC004C003
How to Fix Windows Activation Error 0xC004C003
Fix activation block error 0xC004C003 after hardware changes or clean installs.
Symptoms
- Windows displays watermark saying it isn't activated
- Activation settings page shows error 0xC004C003
Common Causes
- Product key has been blocked by Microsoft licensing servers
- Significant motherboard or CPU hardware changes
Step-by-Step Solutions
Method 1: Link Microsoft Account with License
Use the Activation Troubleshooter to re-link hardware IDs.
- Navigate to Settings > Update & Security > Activation.
- Click Troubleshoot.
- Choose I changed hardware on this device recently and sign in to your Microsoft Account.
Frequently Asked Questions
Yes, if you install a different edition of Windows (e.g. Pro instead of Home) than was originally licensed.